Issue with muting column names in bteq export file

I am trying to export the 3 differrent select queries output to a single file (refer below)

bteq << EOB > log.txt

.logon **********************

.export report file=result.txt

.set width 1000

.set TITLEDASHES ON;

--1st query

select metric, count(*) from tab1

-- 2nd query

select metric,count(*) from tab2;

--3rd query

select metric, count(*) from tab3;

.export reset

.quit;

EOB

The above script is printing the column names 3 times in the result.txt but i want to print only once. I tried multiple options to avoid printing the column names for the 2nd and 3rd query but i couldn't able to figure it out. Could someone please help me on this.